Wow! Let me tell you I know these labels backwards and forwards. I used to work for a non-profit television station and had to run the mailing list labels way back when the servers were kept in other rooms and that was only for 10-15,000 names! I and another gentleman had to count these labels one by one to verify that the computer had an accurate count printed for postage, and let me tell you, when you have telethon 4 times a year not to mention the usual mailings that was a lot of printing and counting! So I say all that to say that these labels NEVER failed. They never jammed, never lost their stickiness, never mis-fed (of course being pin fed helped, but still...). These things are great! While I hated the fact that I had to spend long hours counting thousands (because the station owners wouldn't believe the computer in those days), I loved the fact that I never had to reprint because of a miscue or smudge or any of that kind of error. I wish I had one of those great printers now just so I could go back to using those labels!